"For example, research by Stanford University and UC Berkeley professors looked at ChatGPT’s ability to identify prime numbers. Even with something as straightforward as math, the researchers found that in March, ChatGPT had 84 percent accuracy in identifying prime versus composite numbers, but by June had only 51 percent accuracy performing the same exercise."

Source: https://www.institutionalinvestor.com/article/2c4fad0w6irk838pca3gg/portfolio/money-is-pouring-into-ai-skeptics-say-its-a-grift-shift